Messages in this thread | | | Date | Mon, 4 Jun 2007 19:54:36 +0200 | From | Ingo Molnar <> | Subject | Re: Interesting interaction between lguest and CFS |
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* Matt Mackall <mpm@selenic.com> wrote:
> With 2.6.22-rc3-mm1, I've got a long-running video transcoding going > on. In other windows, I'm compiling, reading email, etc. with no > noticeable problems. > > If I fire up lguest and leave it sitting at a shell prompt for a > couple moments, when I return to type something at the prompt, it can > take 2-3 seconds for my input to echo. Once it starts responding, > typing latency disappears. Suspend the other app and the latency > disappears. > > The system isn't swapping and has basically no I/O load.
could you send me the /proc/PID/sched file of that task which shows this 2-3 seconds delay? (if it's a shell and a graphical terminal then please send the sched-debug file of both.) I suspect the latency goes away if you strace -f the shell task(s)? If not then please send the strace output too.
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